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CVE-2026-68278: Linux

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CVSS

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Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

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    Описание

    Оригинално описание

    In the Linux kernel, the following vulnerability has been resolved: drm/dp/mst: fix buffer overflows in sideband chunk accumulation drm_dp_sideband_append_payload() has three related bugs when processing device-provided sideband reply data: 1. Zero-length curchunk_len underflow: msg_len is a 6-bit field taken directly from the DP sideband header. If a device sends msg_len=0, curchunk_len is set to zero. The condition (curchunk_idx >= curchunk_len) is immediately true, and curchunk_len-1 wraps to 255 (u8 underflow). drm_dp_msg_data_crc4() reads 255 bytes from chunk[48], then memcpy() writes 255 bytes into msg[], both far out of bounds. 2. chunk[48] overflow: curchunk_len can reach 63 (6-bit field). chunk[] is only 48 bytes. Multi-iteration payload assembly appends 16-byte blocks until curchunk_idx reaches curchunk_len, writing up to 15 bytes past the end of chunk[] into msg[]. 3. msg[256] overflow: each chunk contributes (curchunk_len-1) bytes to msg[]. No check ensures curlen + (curchunk_len-1) stays within msg[256], so the memcpy can spill into adjacent struct fields. All three are reachable from any DP MST device that can forge sideband reply messages on a physical connection.

    Засегнати продукти

    • Linux Linux: ad7f8a1f9ced7f049f9b66d588723f243a7034cd преди ef2ecb6cf268debf3890df99fea01b6452dcf78e; ad7f8a1f9ced7f049f9b66d588723f243a7034cd преди d4e05dedb252ed3e540a0c9be511e427f098110a; ad7f8a1f9ced7f049f9b66d588723f243a7034cd преди 4d5109075a787de28c9e89940f9dee45269f91fa; ad7f8a1f9ced7f049f9b66d588723f243a7034cd преди 53937a2787d29c7a460e984dc4f20ff6ac91dc65; ad7f8a1f9ced7f049f9b66d588723f243a7034cd преди ef0dbcc200c3389f1f781ab181932a97e54b51af; ad7f8a1f9ced7f049f9b66d588723f243a7034cd преди 1e5827839ad0ceb0079d1560c321fa3656b54f21; ad7f8a1f9ced7f049f9b66d588723f243a7034cd преди a6366b551079c79bf7bdbadd74c97358bcfe2d58; ad7f8a1f9ced7f049f9b66d588723f243a7034cd преди 55bd5e685bda455b9b50c835f8c8442d52a344a3
    • Linux Linux: 3.17; преди 3.17; 5.10.266 до 5.10.*; 5.15.217 до 5.15.*; 6.1.183 до 6.1.*; 6.6.148 до 6.6.*; 6.12.101 до 6.12.*; 6.18.42 до 6.18.*; 7.1.6 до 7.1.*; от 7.2 нататък

    История

    • 10 август 2026 Публикувано

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    Първоизточници

    CVE-2026-68278: Linux | freedomonline.bg